Adapt to upstream changes (thanks bim9262)

1 files changed, 500 insertions, 104 deletions

diff --git a/config.toml b/config.toml
index 864f3d808db1..218393a349f6 100644
--- a/config.toml
+++ b/config.toml
@@ -9,24 +9,74 @@
 # a custom configuration file can also be specified with `--config` to the build
 # system.
 
+# Keeps track of the last version of `x.py` used.
+# If it does not match the version that is currently running,
+# `x.py` will prompt you to update it and read the changelog.
+# See `src/bootstrap/CHANGELOG.md` for more information.
+changelog-seen = 2
+
+# =============================================================================
+# Global Settings
+# =============================================================================
+
+# Use different pre-set defaults than the global defaults.
+#
+# See `src/bootstrap/defaults` for more information.
+# Note that this has no default value (x.py uses the defaults in `config.toml.example`).
+#profile = <none>
+
 # =============================================================================
 # Tweaking how LLVM is compiled
 # =============================================================================
 [llvm]
 
-# Indicates whether rustc will support compilation with LLVM
-# note: rustc does not compile without LLVM at the moment
-#enabled = true
+# Whether to use Rust CI built LLVM instead of locally building it.
+#
+# Unless you're developing for a target where Rust CI doesn't build a compiler
+# toolchain or changing LLVM locally, you probably want to set this to true.
+#
+# This is false by default so that distributions don't unexpectedly download
+# LLVM from the internet.
+#
+# All tier 1 targets are currently supported; set this to `"if-available"` if
+# you are not sure whether you're on a tier 1 target.
+#
+# We also currently only support this when building LLVM for the build triple.
+#
+# Note that many of the LLVM options are not currently supported for
+# downloading. Currently only the "assertions" option can be toggled.
+#download-ci-llvm = false
+
+# Indicates whether LLVM rebuild should be skipped when running bootstrap. If
+# this is `false` then the compiler's LLVM will be rebuilt whenever the built
+# version doesn't have the correct hash. If it is `true` then LLVM will never
+# be rebuilt. The default value is `false`.
+#skip-rebuild = false
 
 # Indicates whether the LLVM build is a Release or Debug build
 #optimize = true
 
+# Indicates whether LLVM should be built with ThinLTO. Note that this will
+# only succeed if you use clang, lld, llvm-ar, and llvm-ranlib in your C/C++
+# toolchain (see the `cc`, `cxx`, `linker`, `ar`, and `ranlib` options below).
+# More info at: https://clang.llvm.org/docs/ThinLTO.html#clang-bootstrap
+#thin-lto = false
+
 # Indicates whether an LLVM Release build should include debug info
 #release-debuginfo = false
 
 # Indicates whether the LLVM assertions are enabled or not
 #assertions = false
 
+# Indicates whether the LLVM testsuite is enabled in the build or not. Does
+# not execute the tests as part of the build as part of x.py build et al,
+# just makes it possible to do `ninja check-llvm` in the staged LLVM build
+# directory when doing LLVM development as part of Rust development.
+#tests = false
+
+# Indicates whether the LLVM plugin is enabled or not
+#plugins = false
+
 # Indicates whether ccache is used when building LLVM
 #ccache = false
 # or alternatively ...
@@ -35,16 +85,14 @@
 # If an external LLVM root is specified, we automatically check the version by
 # default to make sure it's within the range that we're expecting, but setting
 # this flag will indicate that this version check should not be done.
-#version-check = false
+#version-check = true
 
-# Link libstdc++ statically into the librustc_llvm instead of relying on a
+# Link libstdc++ statically into the rustc_llvm instead of relying on a
 # dynamic version to be available.
-#static-libstdcpp = false
+#static-libstdcpp = true
 
-# Tell the LLVM build system to use Ninja instead of the platform default for
-# the generated build system. This can sometimes be faster than make, for
-# example.
-#ninja = false
+# Whether to use Ninja to build LLVM. This runs much faster than make.
+#ninja = true
 
 # LLVM targets to build support for.
 # Note: this is NOT related to Rust compilation targets. However, as Rust is
@@ -55,14 +103,13 @@
 # support. You'll need to write a target specification at least, and most
 # likely, teach rustc about the C ABI of the target. Get in touch with the
 # Rust team and file an issue if you need assistance in porting!
-#targets = "X86;ARM;AArch64;Mips;PowerPC;SystemZ;JSBackend;MSP430;Sparc;NVPTX;Hexagon"
+#targets = "AArch64;ARM;BPF;Hexagon;MSP430;Mips;NVPTX;PowerPC;RISCV;Sparc;SystemZ;WebAssembly;X86"
 
 # LLVM experimental targets to build support for. These targets are specified in
 # the same format as above, but since these targets are experimental, they are
 # not built by default and the experimental Rust compilation targets that depend
-# on them will not work unless the user opts in to building them. By default the
-# `WebAssembly` target is enabled when compiling LLVM from scratch.
-#experimental-targets = "WebAssembly"
+# on them will not work unless the user opts in to building them.
+#experimental-targets = "AVR;M68k"
 
 # Cap the number of parallel linker invocations when compiling LLVM.
 # This can be useful when building LLVM with debug info, which significantly
@@ -74,48 +121,123 @@
 
 # When invoking `llvm-config` this configures whether the `--shared` argument is
 # passed to prefer linking to shared libraries.
+# NOTE: `thin-lto = true` requires this to be `true` and will give an error otherwise.
 link-shared = true
 
+# When building llvm, this configures what is being appended to the version.
+# The default is "-rust-$version-$channel", except for dev channel where rustc
+# version number is omitted. To use LLVM version as is, provide an empty string.
+#version-suffix = "-rust-dev"
+
+# On MSVC you can compile LLVM with clang-cl, but the test suite doesn't pass
+# with clang-cl, so this is special in that it only compiles LLVM with clang-cl.
+# Note that this takes a /path/to/clang-cl, not a boolean.
+#clang-cl = cc
+
+# Pass extra compiler and linker flags to the LLVM CMake build.
+#cflags = ""
+#cxxflags = ""
+#ldflags = ""
+
+# Use libc++ when building LLVM instead of libstdc++. This is the default on
+# platforms already use libc++ as the default C++ library, but this option
+# allows you to use libc++ even on platforms when it's not. You need to ensure
+# that your host compiler ships with libc++.
+#use-libcxx = false
+
+# The value specified here will be passed as `-DLLVM_USE_LINKER` to CMake.
+#use-linker = <none> (path)
+
+# Whether or not to specify `-DLLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN=YES`
+#allow-old-toolchain = false
+
+# Whether to include the Polly optimizer.
+#polly = false
+
+# Whether to build the clang compiler.
+# clang = false
+
+# Custom CMake defines to set when building LLVM.
+#build-config = {}
+
 # =============================================================================
 # General build configuration options
 # =============================================================================
 [build]
+# The default stage to use for the `check` subcommand
+#check-stage = 0
+
+# The default stage to use for the `doc` subcommand
+#doc-stage = 0
+
+# The default stage to use for the `build` subcommand
+#build-stage = 1
+
+# The default stage to use for the `test` subcommand
+#test-stage = 1
+
+# The default stage to use for the `dist` subcommand
+#dist-stage = 2
+
+# The default stage to use for the `install` subcommand
+#install-stage = 2
+
+# The default stage to use for the `bench` subcommand
+#bench-stage = 2
 
 # Build triple for the original snapshot compiler. This must be a compiler that
 # nightlies are already produced for. The current platform must be able to run
 # binaries of this build triple and the nightly will be used to bootstrap the
 # first compiler.
-#build = "x86_64-unknown-linux-gnu"    # defaults to your host platform
+#
+# Defaults to platform where `x.py` is run.
+#build = "x86_64-unknown-linux-gnu" (as an example)
 
-# In addition to the build triple, other triples to produce full compiler
-# toolchains for. Each of these triples will be bootstrapped from the build
-# triple and then will continue to bootstrap themselves. This platform must
-# currently be able to run all of the triples provided here.
-#host = ["x86_64-unknown-linux-gnu"]   # defaults to just the build triple
+# Which triples to produce a compiler toolchain for. Each of these triples will
+# be bootstrapped from the build triple themselves.
+#
+# Defaults to just the build triple.
+#host = ["x86_64-unknown-linux-gnu"] (as an example)
 
-# In addition to all host triples, other triples to produce the standard library
-# for. Each host triple will be used to produce a copy of the standard library
-# for each target triple.
-#target = ["x86_64-unknown-linux-gnu"] # defaults to just the build triple
+# Which triples to build libraries (core/alloc/std/test/proc_macro) for. Each of
+# these triples will be bootstrapped from the build triple themselves.
+#
+# Defaults to `host`. If you set this explicitly, you likely want to add all
+# host triples to this list as well in order for those host toolchains to be
+# able to compile programs for their native target.
+#target = ["x86_64-unknown-linux-gnu"] (as an example)
 
-# Instead of downloading the src/stage0.txt version of Cargo specified, use
+# Use this directory to store build artifacts.
+# You can use "$ROOT" to indicate the root of the git repository.
+#build-dir = "build"
+
+# Instead of downloading the src/stage0.json version of Cargo specified, use
 # this Cargo binary instead to build all Rust code
-#cargo = "/path/to/bin/cargo"
+#cargo = "/path/to/cargo"
 
-# Instead of downloading the src/stage0.txt version of the compiler
+# Instead of downloading the src/stage0.json version of the compiler
 # specified, use this rustc binary instead as the stage0 snapshot compiler.
-#rustc = "/path/to/bin/rustc"
+#rustc = "/path/to/rustc"
+
+# Instead of download the src/stage0.json version of rustfmt specified,
+# use this rustfmt binary instead as the stage0 snapshot rustfmt.
+#rustfmt = "/path/to/rustfmt"
 
 # Flag to specify whether any documentation is built. If false, rustdoc and
 # friends will still be compiled but they will not be used to generate any
 # documentation.
 #docs = true
 
+# Flag to specify whether CSS, JavaScript, and HTML are minified when
+# docs are generated. JSON is always minified, because it's enormous,
+# and generated in already-minified form from the beginning.
+#docs-minification = true
+
 # Indicate whether the compiler should be documented in addition to the standard
 # library and facade crates.
 #compiler-docs = false
 
-# Indicate whether submodules are managed and updated automatically.
+# Indicate whether git submodules are managed and updated automatically.
 #submodules = true
 
 # The path to (or name of) the GDB executable to use. This is only used for
@@ -128,8 +250,9 @@ link-shared = true
 
 # Python interpreter to use for various tasks throughout the build, notably
 # rustdoc tests, the lldb python interpreter, and some dist bits and pieces.
-# Note that Python 2 is currently required.
-#python = "python2.7"
+#
+# Defaults to the Python interpreter used to execute x.py
+#python = "python"
 
 # Force Cargo to check that Cargo.lock describes the precise dependency
 # set that all the Cargo.toml files create, instead of updating it.
@@ -138,32 +261,39 @@ link-shared = true
 # Indicate whether the vendored sources are used for Rust dependencies or not
 #vendor = false
 
-# Typically the build system will build the rust compiler twice. The second
+# Typically the build system will build the Rust compiler twice. The second
 # compiler, however, will simply use its own libraries to link against. If you
 # would rather to perform a full bootstrap, compiling the compiler three times,
 # then you can set this option to true. You shouldn't ever need to set this
 # option to true.
 #full-bootstrap = false
 
-# Enable a build of the extended rust tool set which is not only the compiler
+# Enable a build of the extended Rust tool set which is not only the compiler
 # but also tools such as Cargo. This will also produce "combined installers"
 # which are used to install Rust and Cargo together. This is disabled by
-# default.
+# default. The `tools` option (immediately below) specifies which tools should
+# be built if `extended = true`.
 extended = true
 
+# Installs chosen set of extended tools if `extended = true`. By default builds
+# all extended tools except `rust-demangler`, unless the target is also being
+# built with `profiler = true`. If chosen tool failed to build the installation
+# fails. If `extended = false`, this option is ignored.
+#tools = ["cargo", "rls", "clippy", "rustfmt", "analysis", "src"] # + "rust-demangler" if `profiler`
+
 # Verbosity level: 0 == not verbose, 1 == verbose, 2 == very verbose
 #verbose = 0
 
 # Build the sanitizer runtimes
 sanitizers = true
 
-# Build the profiler runtime
+# Build the profiler runtime (required when compiling with options that depend
+# on this runtime, such as `-C profile-generate` or `-C instrument-coverage`).
 profiler = true
 
-# Indicates whether the OpenSSL linked into Cargo will be statically linked or
-# not. If static linkage is specified then the build system will download a
-# known-good version of OpenSSL, compile it, and link it to Cargo.
-#openssl-static = false
+# Indicates whether the native libraries linked into Cargo will be statically
+# linked or not.
+#cargo-native-static = false
 
 # Run the build with low priority, by setting the process group's "nice" value
 # to +10 on Unix platforms, and by using a "low priority" job object on Windows.
@@ -178,13 +308,35 @@ profiler = true
 # essentially skipping stage0 as the local compiler is recompiling itself again.
 #local-rebuild = false
 
+# Print out how long each rustbuild step took (mostly intended for CI and
+# tracking over time)
+#print-step-timings = false
+
+# Print out resource usage data for each rustbuild step, as defined by the Unix
+# struct rusage. (Note that this setting is completely unstable: the data it
+# captures, what platforms it supports, the format of its associated output, and
+# this setting's very existence, are all subject to change.)
+#print-step-rusage = false
+
+# Always patch binaries for usage with Nix toolchains. If `true` then binaries
+# will be patched unconditionally. If `false` or unset, binaries will be patched
+# only if the current distribution is NixOS. This option is useful when using
+# a Nix toolchain on non-NixOS distributions.
+#patch-binaries-for-nix = false
+
+# Collect information and statistics about the current build and writes it to
+# disk. Enabling this or not has no impact on the resulting build output. The
+# schema of the file generated by the build metrics feature is unstable, and
+# this is not intended to be used during local development.
+#metrics = false
+
 # =============================================================================
 # General install configuration options
 # =============================================================================
 [install]
 
 # Instead of installing to /usr/local, install to this path instead.
-prefix = '/usr'
+prefix = "/usr"
 
 # Where to install system configuration files
 # If this is a relative path, it will get installed in `prefix` above
@@ -202,94 +354,290 @@ prefix = '/usr'
 # Where to install man pages in `prefix` above
 #mandir = "share/man"
 
+# Where to install data in `prefix` above
+#datadir = "share"
+
 # =============================================================================
 # Options for compiling Rust code itself
 # =============================================================================
 [rust]
 
-# Indicates that the build should be optimized for debugging Rust. Note that
-# this is typically not what you want as it takes an incredibly large amount of
-# time to have a debug-mode rustc compile any code (notably libstd). If this
-# value is set to `true` it will affect a number of configuration options below
-# as well, if unconfigured.
+# Whether or not to optimize the compiler and standard library.
+# WARNING: Building with optimize = false is NOT SUPPORTED. Due to bootstrapping,
+# building without optimizations takes much longer than optimizing. Further, some platforms
+# fail to build without this optimization (c.f. #65352).
+#optimize = true
+
+# Indicates that the build should be configured for debugging Rust. A
+# `debug`-enabled compiler and standard library will be somewhat
+# slower (due to e.g. checking of debug assertions) but should remain
+# usable.
+#
+# Note: If this value is set to `true`, it will affect a number of
+#       configuration options below as well, if they have been left
+#       unconfigured in this file.
+#
+# Note: changes to the `debug` setting do *not* affect `optimize`
+#       above. In theory, a "maximally debuggable" environment would
+#       set `optimize` to `false` above to assist the introspection
+#       facilities of debuggers like lldb and gdb. To recreate such an
+#       environment, explicitly set `optimize` to `false` and `debug`
+#       to `true`. In practice, everyone leaves `optimize` set to
+#       `true`, because an unoptimized rustc with debugging
+#       enabled becomes *unusably slow* (e.g. rust-lang/rust#24840
+#       reported a 25x slowdown) and bootstrapping the supposed
+#       "maximally debuggable" environment (notably libstd) takes
+#       hours to build.
+#
 #debug = false
 
-# Whether or not to optimize the compiler and standard library
-# Note: the slowness of the non optimized compiler compiling itself usually
-#       outweighs the time gains in not doing optimizations, therefore a
-#       full bootstrap takes much more time with optimize set to false.
-#optimize = true
+# Whether to download the stage 1 and 2 compilers from CI.
+# This is mostly useful for tools; if you have changes to `compiler/` they will be ignored.
+#
+# You can set this to "if-unchanged" to only download if `compiler/` has not been modified.
+#download-rustc = false
 
 # Number of codegen units to use for each compiler invocation. A value of 0
 # means "the number of cores on this machine", and 1+ is passed through to the
 # compiler.
-#codegen-units = 1
+#
+# Uses the rustc defaults: https://doc.rust-lang.org/rustc/codegen-options/index.html#codegen-units
+#codegen-units = if incremental { 256 } else { 16 }
+
+# Sets the number of codegen units to build the standard library with,
+# regardless of what the codegen-unit setting for the rest of the compiler is.
+# NOTE: building with anything other than 1 is known to occasionally have bugs.
+# See https://github.com/rust-lang/rust/issues/83600.
+#codegen-units-std = codegen-units
 
 # Whether or not debug assertions are enabled for the compiler and standard
-# library. Also enables compilation of debug! and trace! logging macros.
-#debug-assertions = false
+# library. Debug assertions control the maximum log level used by rustc. When
+# enabled calls to `trace!` and `debug!` macros are preserved in the compiled
+# binary, otherwise they are omitted.
+#
+# Defaults to rust.debug value
+#debug-assertions = rust.debug (boolean)
 
-# Whether or not debuginfo is emitted
-#debuginfo = false
+# Whether or not debug assertions are enabled for the standard library.
+# Overrides the `debug-assertions` option, if defined.
+#
+# Defaults to rust.debug-assertions value
+#debug-assertions-std = rust.debug-assertions (boolean)
 
-# Whether or not line number debug information is emitted
-#debuginfo-lines = false
+# Whether or not to leave debug! and trace! calls in the rust binary.
+# Overrides the `debug-assertions` option, if defined.
+#
+# Defaults to rust.debug-assertions value
+#
+# If you see a message from `tracing` saying
+# `max_level_info` is enabled and means logging won't be shown,
+# set this value to `true`.
+#debug-logging = rust.debug-assertions (boolean)
 
-# Whether or not to only build debuginfo for the standard library if enabled.
-# If enabled, this will not compile the compiler with debuginfo, just the
-# standard library.
-#debuginfo-only-std = false
+# Whether or not overflow checks are enabled for the compiler and standard
+# library.
+#
+# Defaults to rust.debug value
+#overflow-checks = rust.debug (boolean)
+
+# Whether or not overflow checks are enabled for the standard library.
+# Overrides the `overflow-checks` option, if defined.
+#
+# Defaults to rust.overflow-checks value
+#overflow-checks-std = rust.overflow-checks (boolean)
+
+# Debuginfo level for most of Rust code, corresponds to the `-C debuginfo=N` option of `rustc`.
+# `0` - no debug info
+# `1` - line tables only - sufficient to generate backtraces that include line
+#       information and inlined functions, set breakpoints at source code
+#       locations, and step through execution in a debugger.
+# `2` - full debug info with variable and type information
+# Can be overridden for specific subsets of Rust code (rustc, std or tools).
+# Debuginfo for tests run with compiletest is not controlled by this option
+# and needs to be enabled separately with `debuginfo-level-tests`.
+#
+# Note that debuginfo-level = 2 generates several gigabytes of debuginfo
+# and will slow down the linking process significantly.
+#
+# Defaults to 1 if debug is true
+#debuginfo-level = 0
+
+# Debuginfo level for the compiler.
+#debuginfo-level-rustc = debuginfo-level
+
+# Debuginfo level for the standard library.
+#debuginfo-level-std = debuginfo-level
+
+# Debuginfo level for the tools.
+#debuginfo-level-tools = debuginfo-level
 
-# Whether or not jemalloc is built and enabled
-use-jemalloc = false
+# Debuginfo level for the test suites run with compiletest.
+# FIXME(#61117): Some tests fail when this option is enabled.
+#debuginfo-level-tests = 0
 
-# Whether or not jemalloc is built with its debug option set
-#debug-jemalloc = false
+# Should rustc be build with split debuginfo? Default is platform dependent.
+# Valid values are the same as those accepted by `-C split-debuginfo`
+# (`off`/`unpacked`/`packed`).
+#
+# On Linux, split debuginfo is disabled by default.
+#
+# On Apple platforms, unpacked split debuginfo is used by default. Unpacked
+# debuginfo does not run `dsymutil`, which packages debuginfo from disparate
+# object files into a single `.dSYM` file. `dsymutil` adds time to builds for
+# no clear benefit, and also makes it more difficult for debuggers to find
+# debug info. The compiler currently defaults to running `dsymutil` to preserve
+# its historical default, but when compiling the compiler itself, we skip it by
+# default since we know it's safe to do so in that case.
+#
+# On Windows platforms, packed debuginfo is the only supported option,
+# producing a `.pdb` file.
+#split-debuginfo = if linux { off } else if windows { packed } else if apple { unpacked }
 
 # Whether or not `panic!`s generate backtraces (RUST_BACKTRACE)
 #backtrace = true
 
-# The default linker that will be hard-coded into the generated compiler for
-# targets that don't specify linker explicitly in their target specifications.
-# Note that this is not the linker used to link said compiler.
-#default-linker = "cc"
+# Whether to always use incremental compilation when building rustc
+#incremental = false
+
+# Build a multi-threaded rustc
+# FIXME(#75760): Some UI tests fail when this option is enabled.
+#parallel-compiler = false
+
+# The default linker that will be hard-coded into the generated
+# compiler for targets that don't specify a default linker explicitly
+# in their target specifications.  Note that this is not the linker
+# used to link said compiler. It can also be set per-target (via the
+# `[target.<triple>]` block), which may be useful in a cross-compilation
+# setting.
+#
+# See https://doc.rust-lang.org/rustc/codegen-options/index.html#linker for more information.
+#default-linker = <none> (path)
 
 # The "channel" for the Rust build to produce. The stable/beta channels only
 # allow using stable features, whereas the nightly and dev channels allow using
 # nightly features
 #channel = "dev"
 
+# A descriptive string to be appended to `rustc --version` output, which is
+# also used in places like debuginfo `DW_AT_producer`. This may be useful for
+# supplementary build information, like distro-specific package versions.
+#
+# The Rust compiler will differentiate between versions of itself, including
+# based on this string, which means that if you wish to be compatible with
+# upstream Rust you need to set this to "". However, note that if you are not
+# actually compatible -- for example if you've backported patches that change
+# behavior -- this may lead to miscompilations or other bugs.
+#description = <none> (string)
+
+# The root location of the musl installation directory. The library directory
+# will also need to contain libunwind.a for an unwinding implementation. Note
+# that this option only makes sense for musl targets that produce statically
+# linked binaries.
+#
+# Defaults to /usr on musl hosts. Has no default otherwise.
+#musl-root = <platform specific> (path)
+
 # By default the `rustc` executable is built with `-Wl,-rpath` flags on Unix
 # platforms to ensure that the compiler is usable by default from the build
 # directory (as it links to a number of dynamic libraries). This may not be
 # desired in distributions, for example.
 #rpath = true
 
-# Suppresses extraneous output from tests to ensure the output of the test
-# harness is relatively clean.
-#quiet-tests = false
+# Prints each test name as it is executed, to help debug issues in the test harness itself.
+#verbose-tests = false
 
-# Flag indicating whether tests are compiled with optimizations (the -O flag) or
-# with debuginfo (the -g flag)
+# Flag indicating whether tests are compiled with optimizations (the -O flag).
 #optimize-tests = true
-#debuginfo-tests = true
 
 # Flag indicating whether codegen tests will be run or not. If you get an error
 # saying that the FileCheck executable is missing, you may want to disable this.
+# Also see the target's llvm-filecheck option.
 codegen-tests = false
 
 # Flag indicating whether git info will be retrieved from .git automatically.
 # Having the git information can cause a lot of rebuilds during development.
-# Note: If this attribute is not explicity set (e.g. if left commented out) it
+# Note: If this attribute is not explicitly set (e.g. if left commented out) it
 # will default to true if channel = "dev", but will default to false otherwise.
 ignore-git = false
 
 # When creating source tarballs whether or not to create a source tarball.
 dist-src = false
 
-# Whether to also run the Miri tests suite when running tests.
-# As a side-effect also generates MIR for all libraries.
-#test-miri = false
+# After building or testing extended tools (e.g. clippy and rustfmt), append the
+# result (broken, compiling, testing) into this JSON file.
+#save-toolstates = <none> (path)
+
+# This is an array of the codegen backends that will be compiled for the rustc
+# that's being compiled. The default is to only build the LLVM codegen backend,
+# and currently the only standard options supported are `"llvm"`, `"cranelift"`
+# and `"gcc"`. The first backend in this list will be used as default by rustc
+# when no explicit backend is specified.
+#codegen-backends = ["llvm"]
+
+# Indicates whether LLD will be compiled and made available in the sysroot for
+# rustc to execute.
+#lld = false
+
+# Indicates whether LLD will be used to link Rust crates during bootstrap on
+# supported platforms. The LLD from the bootstrap distribution will be used
+# and not the LLD compiled during the bootstrap.
+#
+# LLD will not be used if we're cross linking.
+#
+# Explicitly setting the linker for a target will override this option when targeting MSVC.
+#use-lld = false
+
+# Indicates whether some LLVM tools, like llvm-objdump, will be made available in the
+# sysroot.
+llvm-tools = true
+
+# Whether to deny warnings in crates
+#deny-warnings = true
+
+# Print backtrace on internal compiler errors during bootstrap
+#backtrace-on-ice = false
+
+# Whether to verify generated LLVM IR
+#verify-llvm-ir = false
+
+# Compile the compiler with a non-default ThinLTO import limit. This import
+# limit controls the maximum size of functions imported by ThinLTO. Decreasing
+# will make code compile faster at the expense of lower runtime performance.
+#thin-lto-import-instr-limit = if incremental { 10 } else { LLVM default (currently 100) }
+
+# Map debuginfo paths to `/rust/$sha/...`, generally only set for releases
+#remap-debuginfo = false
+
+# Link the compiler against `jemalloc`, where on Linux and OSX it should
+# override the default allocator for rustc and LLVM.
+jemalloc = true
+
+# Run tests in various test suites with the "nll compare mode" in addition to
+# running the tests in normal mode. Largely only used on CI and during local
+# development of NLL
+#test-compare-mode = false
+
+# Global default for llvm-libunwind for all targets. See the target-specific
+# documentation for llvm-libunwind below. Note that the target-specific
+# option will override this if set.
+#llvm-libunwind = 'no'
+
+# Enable Windows Control Flow Guard checks in the standard library.
+# This only applies from stage 1 onwards, and only for Windows targets.
+#control-flow-guard = false
+
+# Enable symbol-mangling-version v0. This can be helpful when profiling rustc,
+# as generics will be preserved in symbols (rather than erased into opaque T).
+# When no setting is given, the new scheme will be used when compiling the
+# compiler and its tools and the legacy scheme will be used when compiling the
+# standard library.
+# If an explicit setting is given, it will be used for all parts of the codebase.
+#new-symbol-mangling = true|false (see comment)
+
+# Select LTO mode that will be used for compiling rustc. By default, thin local LTO
+# (LTO within a single crate) is used (like for any Rust crate). You can also select
+# "thin" or "fat" to apply Thin/Fat LTO to the `rustc_driver` dylib.
+#lto = "thin-local"
 
 # =============================================================================
 # Options for specific targets
@@ -299,53 +647,98 @@ dist-src = false
 # =============================================================================
 [target.x86_64-unknown-linux-gnu]
 
-# C compiler to be used to compiler C code. Note that the
+# C compiler to be used to compile C code. Note that the
 # default value is platform specific, and if not specified it may also depend on
 # what platform is crossing to what platform.
-#cc = "cc"
+# See `src/bootstrap/cc_detect.rs` for details.
+#cc = "cc" (path)
 
-# C++ compiler to be used to compiler C++ code (e.g. LLVM and our LLVM shims).
+# C++ compiler to be used to compile C++ code (e.g. LLVM and our LLVM shims).
 # This is only used for host targets.
-#cxx = "c++"
+# See `src/bootstrap/cc_detect.rs` for details.
+#cxx = "c++" (path)
 
 # Archiver to be used to assemble static libraries compiled from C/C++ code.
 # Note: an absolute path should be used, otherwise LLVM build will break.
-#ar = "ar"
+#ar = "ar" (path)
+
+# Ranlib to be used to assemble static libraries compiled from C/C++ code.
+# Note: an absolute path should be used, otherwise LLVM build will break.
+#ranlib = "ranlib" (path)
 
-# Linker to be used to link Rust code. Note that the
+# Linker to be used to bootstrap Rust code. Note that the
 # default value is platform specific, and if not specified it may also depend on
 # what platform is crossing to what platform.
-#linker = "cc"
+# Setting this will override the `use-lld` option for Rust code when targeting MSVC.
+#linker = "cc" (path)
 
 # Path to the `llvm-config` binary of the installation of a custom LLVM to link
-# against. Note that if this is specifed we don't compile LLVM at all for this
+# against. Note that if this is specified we don't compile LLVM at all for this
 # target.
 llvm-config = '/usr/bin/llvm-config'
 
-# Path to the custom jemalloc static library to link into the standard library
-# by default. This is only used if jemalloc is still enabled above
-#jemalloc = "/path/to/jemalloc/libjemalloc_pic.a"
+# Override detection of whether this is a Rust-patched LLVM. This would be used
+# in conjunction with either an llvm-config or build.submodules = false.
+#llvm-has-rust-patches = if llvm-config { false } else { true }
+
+# Normally the build system can find LLVM's FileCheck utility, but if
+# not, you can specify an explicit file name for it.
+#llvm-filecheck = "/path/to/llvm-version/bin/FileCheck"
+
+# Use LLVM libunwind as the implementation for Rust's unwinder.
+# Accepted values are 'in-tree' (formerly true), 'system' or 'no' (formerly false).
+# This option only applies for Linux and Fuchsia targets.
+# On Linux target, if crt-static is not enabled, 'no' means dynamic link to
+# `libgcc_s.so`, 'in-tree' means static link to the in-tree build of llvm libunwind
+# and 'system' means dynamic link to `libunwind.so`. If crt-static is enabled,
+# the behavior is depend on the libc. On musl target, 'no' and 'in-tree' both
+# means static link to the in-tree build of llvm libunwind, and 'system' means
+# static link to `libunwind.a` provided by system. Due to the limitation of glibc,
+# it must link to `libgcc_eh.a` to get a working output, and this option have no effect.
+#llvm-libunwind = 'no' if Linux, 'in-tree' if Fuchsia
 
 # If this target is for Android, this option will be required to specify where
 # the NDK for the target lives. This is used to find the C compiler to link and
 # build native code.
-#android-ndk = "/path/to/ndk"
+# See `src/bootstrap/cc_detect.rs` for details.
+#android-ndk = <none> (path)
+
+# Build the sanitizer runtimes for this target.
+# This option will override the same option under [build] section.
+#sanitizers = build.sanitizers (bool)
+
+# Build the profiler runtime for this target(required when compiling with options that depend
+# on this runtime, such as `-C profile-generate` or `-C instrument-coverage`).
+# This option will override the same option under [build] section.
+#profiler = build.profiler (bool)
 
 # Force static or dynamic linkage of the standard library for this target. If
 # this target is a host for rustc, this will also affect the linkage of the
 # compiler itself. This is useful for building rustc on targets that normally
 # only use static libraries. If unset, the target's default linkage is used.
-#crt-static = false
+#crt-static = <platform-specific> (bool)
 
-# The root location of the MUSL installation directory. The library directory
+# The root location of the musl installation directory. The library directory
 # will also need to contain libunwind.a for an unwinding implementation. Note
-# that this option only makes sense for MUSL targets that produce statically
-# linked binaries
-#musl-root = "..."
+# that this option only makes sense for musl targets that produce statically
+# linked binaries.
+#musl-root = build.musl-root (path)
+
+# The full path to the musl libdir.
+#musl-libdir = musl-root/lib
+
+# The root location of the `wasm32-wasi` sysroot. Only used for the
+# `wasm32-wasi` target. If you are building wasm32-wasi target, make sure to
+# create a `[target.wasm32-wasi]` section and move this field there.
+#wasi-root = <none> (path)
 
 # Used in testing for configuring where the QEMU images are located, you
 # probably don't want to use this.
-#qemu-rootfs = "..."
+#qemu-rootfs = <none> (path)
+
+# Skip building the `std` library for this target. Enabled by default for
+# target triples containing `-none`, `nvptx`, `switch`, or `-uefi`.
+#no-std = <platform-specific> (bool)
 
 # =============================================================================
 # Distribution options
@@ -362,12 +755,7 @@ llvm-config = '/usr/bin/llvm-config'
 #
 # This folder should be populated ahead of time before the build system is
 # invoked.
-#sign-folder = "path/to/folder/to/sign"
-
-# This is a file which contains the password of the default gpg key. This will
-# be passed to `gpg` down the road when signing all files in `sign-folder`
-# above. This should be stored in plaintext.
-#gpg-password-file = "path/to/gpg/password"
+#sign-folder = <none> (path)
 
 # The remote address that all artifacts will eventually be uploaded to. The
 # build system generates manifests which will point to these urls, and for the
@@ -375,7 +763,7 @@ llvm-config = '/usr/bin/llvm-config'
 #
 # Note that this address should not contain a trailing slash as file names will
 # be appended to it.
-#upload-addr = "https://example.com/folder"
+#upload-addr = <none> (URL)
 
 # Whether to build a plain source tarball to upload
 # We disable that on Windows not to override the one already uploaded on S3
@@ -383,3 +771,11 @@ llvm-config = '/usr/bin/llvm-config'
 # on linux
 #src-tarball = true
 
+# Whether to allow failures when building tools
+#missing-tools = false
+
+# List of compression formats to use when generating dist tarballs. The list of
+# formats is provided to rust-installer, which must support all of them.
+#
+# This list must be non-empty.
+#compression-formats = ["gz", "xz"]